A new potassium-based intermediate and its role in the desorption properties of the K–Mg–N–H system

Santoru, Antonio; Garroni, Sebastiano; Pistidda, Claudio; Milanese, Chiara; Girella, Alessandro; Marini, Amedeo; Masolo, Elisabetta; Valentoni, Antonio; Bergemann, Nils; Le, Thi-Thu; Cao, Hujun; Haase, Dörthe; Balmès, Olivier; Taube, K.; Mulas, G.; Enzo, Stefano; Klassen, Thomas; Dornheim, Martin

doi:10.1039/c5cp06963g

Cited by 11 publications

(10 citation statements)

References 68 publications

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“…The Mg(NH 2 ) 2 + KH composite led to the formation of KMgNH 2 NH. In both systems; however, KH and KNH 2 reacted in an unexpected way, where with the progress of the reactions, their diffraction peaks gradually shifted in 2θ-scale rather than simply increasing or decreasing in intensity [218]. This behaviour was similarly reported for the ammonolysis process of KH, implying unexpected expansions and contractions of the cubic cell [211].…”

Section: K-mg-n-h Systemsupporting

confidence: 64%

“…However, none of the other bimetallic phases previously reported (K 2 Mg(NH 2 ) 2 NH, K 2 Mg(NH) 2 and KMgN) were found as reaction product, by ex situ XPD [214,216,217]. In order to clarify this aspect, the K-Mg-N-H system was studied by Santoru et al [218] by in situ SR-XPD, confirming that no bimetallic phases were formed, in addition to K 2 Mg(NH 2 ) 4 and KMgNH 2 NH. For the KNH 2 + MgH 2 composite the K-Mg-N ratio was calculated in order to release all possible hydrogen forming the speculated bimetallic nitride, KMgN.…”

Section: K-mg-n-h Systemmentioning

confidence: 99%

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A Review of the MSCA ITN ECOSTORE—Novel Complex Metal Hydrides for Efficient and Compact Storage of Renewable Energy as Hydrogen and Electricity

et al. 2020

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Hydrogen as an energy carrier is very versatile in energy storage applications. Developments in novel, sustainable technologies towards a CO2-free society are needed and the exploration of all-solid-state batteries (ASSBs) as well as solid-state hydrogen storage applications based on metal hydrides can provide solutions for such technologies. However, there are still many technical challenges for both hydrogen storage material and ASSBs related to designing low-cost materials with low-environmental impact. The current materials considered for all-solid-state batteries should have high conductivities for Na+, Mg2+ and Ca2+, while Al3+-based compounds are often marginalised due to the lack of suitable electrode and electrolyte materials. In hydrogen storage materials, the sluggish kinetic behaviour of solid-state hydride materials is one of the key constraints that limit their practical uses. Therefore, it is necessary to overcome the kinetic issues of hydride materials before discussing and considering them on the system level. This review summarizes the achievements of the Marie Skłodowska-Curie Actions (MSCA) innovative training network (ITN) ECOSTORE, the aim of which was the investigation of different aspects of (complex) metal hydride materials. Advances in battery and hydrogen storage materials for the efficient and compact storage of renewable energy production are discussed.

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Section: K-mg-n-h Systemsupporting

confidence: 64%

Section: K-mg-n-h Systemmentioning

confidence: 99%

A Review of the MSCA ITN ECOSTORE—Novel Complex Metal Hydrides for Efficient and Compact Storage of Renewable Energy as Hydrogen and Electricity

et al. 2020

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“…Recently, new intermediate compositions were identified in the K–N–H system and reported as the first metal amide/hydride solid solution . The same components were reported to take part in the desorption processes of K–Mg–N–H systems, promoting a novel amide-hydride anionic-exchange mechanism . Structural similarities between compounds of potassium and rubidium are not a peculiarity of bimetallic M–Mg–N–H systems, as they also occur in other classes of compounds, e.g., metal amides (MNH 2 ) and metal hydrides (MH).…”

Section: Results and Discussionmentioning

confidence: 99%

Insights into the Rb–Mg–N–H System: an Ordered Mixed Amide/Imide Phase and a Disordered Amide/Hydride Solid Solution

et al. 2018

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The crystal structure of a mixed amide-imide phase, RbMgNDND, has been solved in the orthorhombic space group Pnma ( a = 9.55256(31), b = 3.70772(11) and c = 10.08308(32) Å). A new metal amide-hydride solid solution, Rb(NH) H, has been isolated and characterized in the entire compositional range. The profound analogies, as well as the subtle differences, with the crystal chemistry of KMgNDND and K(NH) H are thoroughly discussed. This approach suggests that the comparable performances obtained using K- and Rb-based additives for the Mg(NH)- 2LiH and 2LiN H-MgH hydrogen storage systems are likely to depend on the structural similarities of possible reaction products and intermediates.

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“…Nevertheless, this enhancement is only temporary due to the unavoidable growth and agglomeration phenomena occurring during dehydrogenation-rehydrogenation cycling. Long-lasting improvements of the kinetic properties of complex hydrides and RHCs can be achieved by using transition metals (TM)-based additives [36,[45][46][47][48][49][50][51][52][53][54]. Several investigations on the effect of the addition of TMbased additives on the kinetic properties of the RHCs have been conducted [45,46,50,[55][56][57][58][59][60][61].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Hydrogen Storage Properties of Li-RHC System with In-House Synthesized AlTi3 Nanoparticles

Pistidda

Puszkiel

et al. 2021

Energies

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In recent years, the use of selected additives for improving the kinetic behavior of the system 2LiH + MgB2 (Li-RHC) has been investigated. As a result, it has been reported that some additives (e.g., 3TiCl3·AlCl3), by reacting with the Li-RHC components, form nanostructured phases (e.g., AlTi3) possessing peculiar microstructural properties capable of enhancing the system’s kinetic behavior. The effect of in-house-produced AlTi3 nanoparticles on the hydrogenation/dehydrogenation kinetics of the 2LiH + MgB2 (Li-RHC) system is explored in this work, with the aim of reaching high hydrogen storage performance. Experimental results show that the AlTi3 nanoparticles significantly improve the reaction rate of the Li-RHC system, mainly for the dehydrogenation process. The observed improvement is most likely due to the similar structural properties between AlTi3 and MgB2 phases which provide an energetically favored path for the nucleation of MgB2. In comparison with the pristine material, the Li-RHC doped with AlTi3 nanoparticles has about a nine times faster dehydrogenation rate. The results obtained from the kinetic modeling indicate a change in the Li-RHC hydrogenation reaction mechanism in the presence of AlTi3 nanoparticles.

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A new potassium-based intermediate and its role in the desorption properties of the K–Mg–N–H system

Cited by 11 publications

References 68 publications

A Review of the MSCA ITN ECOSTORE—Novel Complex Metal Hydrides for Efficient and Compact Storage of Renewable Energy as Hydrogen and Electricity

A Review of the MSCA ITN ECOSTORE—Novel Complex Metal Hydrides for Efficient and Compact Storage of Renewable Energy as Hydrogen and Electricity

Insights into the Rb–Mg–N–H System: an Ordered Mixed Amide/Imide Phase and a Disordered Amide/Hydride Solid Solution

Enhanced Hydrogen Storage Properties of Li-RHC System with In-House Synthesized AlTi3 Nanoparticles

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